<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>列表样式</title>
    <style>
        ol{
            list-style: none;
        }
        ul{
            list-style: decimal;
        }
    </style>
</head>
<body>
    <ol>
        <li>1</li>
        <li>2</li>
        <li>3</li>
    </ol>
    <ul>
        <li>A</li>
        <li>B</li>
        <li>C</li>
    </ul>
</body>
</html>